Ebean One to Many Mapping not working. - orm

Question

I am writing a web app that has products, customers, credit cards and a cart. Customer has a one to many mapping on both credit cards and carts. In my customer class i have a list and list. When i access customer.creditCardList everything works. When i try the same for customer.shoppingCartList i get this error.
error] Test models.ModelsTest.createAndRetrieveCart failed: javax.persistence.PersistenceException:
ERROR executing DML bindLog[] error[Field 'customer_id' doesn't have a default value]
Before i was getting no error but my shoppingCartList was always empty even with items in the database.
Here is my test function which is throwing the error:
#Test
public void createAndRetrieveCart(){
Customer walter = Customer.find.where().eq("email", "test#banananow.com").findUnique();
Product p1 = Product.find.where().idEq(1).findUnique();
Product p2 = Product.find.where().idEq(2).findUnique();
new ShoppingCart(walter, p1, 2).save();
new ShoppingCart(walter, p2, 3).save();
if(walter.shoppingCartList.size() < 2){
assert(false);
}
for(ShoppingCart cart : walter.shoppingCartList){
assertNotNull(cart.product.name);
assertNotNull(cart.product.price);
System.out.println(cart.product.name);
System.out.println(cart.product.price);
System.out.println(cart.quantity);
}
}
The error occurs on line 123 which is the first ShoppingCart.save()
The weird part is almost identical code for creditCardList passes and works properly. Here is that test
public void createAndAddCreditCard(){
Customer walter = Customer.find.where().eq("email", "tester#test.com").findUnique();
//Date date = new Date(2017, 10, 1);
//new CreditCard(1234567812345679L, walter, "walter wooodall", date, 21919, 123).save();
for(CreditCard card : walter.creditCardList){
System.out.println(card.number);
}
}
Here are my models:
Customer:
#Entity
public class Customer extends Model {
#Id
public int id;
public String email;
public String password;
public String name;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="address_id")
public Address address;
public double balance;
#OneToMany(mappedBy = "customer")
public List<CreditCard> creditCardList;
#OneToMany(mappedBy = "customer")
public List<Basket> basketList;
#OneToMany(mappedBy = "customer")
public List<ShoppingCart> shoppingCartList;
public Customer(String email, String password, String name, Address address){
this.email = email.toLowerCase();
this.password = password;
this.name = name.toLowerCase();
this.address = address;
this.balance = 0.0;
//this.creditCardList = new ArrayList<CreditCard>();
//this.shoppingCartList = new ArrayList<ShoppingCart>();
}
public static Finder<String, Customer> find = new Finder<String, Customer>(String.class, Customer.class);
public static Customer authenticate(String email, String password) {
return find.where().eq("email", email)
.eq("password", password).findUnique();
}
public static Customer exists(String email) {
return find.where().eq("email", email).findUnique();
}
/*
public List<CreditCard> getCreditCardList(){
return CreditCard.find.where().eq("customer_id", this.id).findList();
}
*/
}
ShopppingCart:
#Entity
#Table(name="shopping_cart")
public class ShoppingCart extends Model{
#Id
public int id;
#ManyToOne
#JoinColumn(name = "customer_id", insertable = false, updatable = false)
public Customer customer;
#ManyToOne
#JoinColumn(name = "product_id", insertable = false, updatable = false)
public Product product;
public int quantity;
public ShoppingCart(Customer customer, Product product, int quantity){
this.customer = customer;
this.product = product;
this.quantity = quantity;
}
public static Finder<String, ShoppingCart> find = new Finder<String, ShoppingCart>(String.class, ShoppingCart.class);
}
Product:
#Entity
public class Product extends Model{
#Id
public int id;
public String name;
public Float price;
public String category;
public String subcategory;
#Column(name = "image_url")
public String imageUrl;
public String url;
#ManyToOne
public Store store;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "product")
public List<BasketProduct> basket_product;
#OneToMany(mappedBy = "product")
public List<ShoppingCart> shoppingCartList;
public Product(String name, Float price, String category, String subcategory, String imageUrl, String url, Store store){
this.name = name;
this.price = price;
this.category = category;
this.subcategory = subcategory;
this.imageUrl = imageUrl;
this.url = url;
this.store = store;
}
public Product(int id, String name, Float price, String category, String subcategory, String imageUrl, String url, Store store){
this.id = id;
this.name = name;
this.price = price;
this.category = category;
this.subcategory = subcategory;
this.imageUrl = imageUrl;
this.url = url;
this.store = store;
}
public static Finder<String, Product> find = new Finder<String, Product>(String.class, Product.class);
public static List<Product> getTopProducts(){
String sql = "select * from top_product";
SqlQuery sqlQuery = Ebean.createSqlQuery(sql);
List<SqlRow> sqlRows = sqlQuery.findList();
List<Product> productList = null;
if(sqlRows != null){
productList = new LinkedList<Product>();
for(SqlRow row : sqlRows){
int id = row.getInteger("id");
String name = row.getString("name");
float price = row.getFloat("price");
String category = row.getString("category");
String subcategory = row.getString("subcategory");
String imageUrl = row.getString("image_url");
String url = row.getString("url");
String storeId = row.getString("store_id");
productList.add(new Product(id, name, price, category, subcategory, imageUrl, url, Store.find.byId(storeId)));
}
}
return productList;
}
#Override
public String toString() {
return "Product{" +
"id=" + id +
", name='" + name + '\'' +
", price=" + price +
", category='" + category + '\'' +
", subcategory='" + subcategory + '\'' +
", image_url='" + imageUrl + '\'' +
", url='" + url + '\'' +
'}';
}
}
I have id, customer_id, product_id and quantity in my table with FK references to customer and product.
Anyone else have this problem and know how to solve??

Answer 1

It seems like following line doesn't read customer:
Customer walter = Customer.find.where().eq("email", "test#banananow.com").findUnique();
Your second test works good but you are querying for customer with different email there. So try to change previous line to:
Customer walter = Customer.find.where().eq("email", "tester#test.com").findUnique();
Socond problem is that you have:
#JoinColumn(name = "customer_id", insertable = false, updatable = false)
#JoinColumn(name = "product_id", insertable = false, updatable = false)
This is why these relations are not saved. Remove these lines.